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S. Z. DE FERRANTL STEAM SUPERHEATING.

APPLICATION FILED APR. 19, 1913.

' Patented Oct. 28,1919.

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STEAM SUPERHEATING.

APPLICATION FILED APR. 19, 1913.

Patented Oct. 28, 1919.

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" SEBASTIAN ZIANI DE FERRANT'I, OF BASLOW, ENGLAND.

STEAM-SUPERHEATIN G.

Application filed April 19, 1913.

To all whom it may concern:

Be it known that l, SEBASTIAN ZIANI DE FERRANTI, a subject of the King of Great Britain and Ireland, and residing at Baslow,

' in the county of Derby, England, have invented certain new and useful Improvements in and Relating to Steam-Superheating, of which the following is a specification. The invention relates to steam superheating and particularly to superheaters working in conjunction with water-tube boilers.

The main objects of the invention are to provide for the efiicient transference to the superheater elements of a large proportion of the heat energy contained in the furnace gases While at the same time arranging for the superheater elements to be more or less by-passed for regulation of the 'superheating particularly when starting up and strapping.

. With this object, the invention consists in a boiler comprising an upper steam drum with one-or more water drums connected thereto by water tubes and provided on at h least one side of thes'team drum with separ; 25

ate ducts for the furnace gases, one or more of such ducts each containing a screen of water tubes in front of superheater elements and a damper beyond the superheating elements and another or others of such ducts containing water tubes only to form a comparatively small superheater by-pass for the furnace gases.

lithe boiler is single-sidd, the super heater and by-pass ducts are necessarily ar ranged on the same side of the steam drum; if, however, the boiler is double-sided, both superheater and bypass ducts may be ar ranged on each side or superheater and by pass ducts on one side only, and superheater ducts alone on the other slde.

The invention also consists in. the superheating arrangements and applications thereof hereinafter described or indicated.

Referring to the accompanying drawings:

Figure 1 is a sectional elevation illustrating-the application of the invention to a reheating turbine.

' Fig 2 is a sectional plan of a boiler and superheater installation having superheaters working at different pressures.

Fig. 3.is a sectional view on line ti-8 of Fi 2'.

Fig. t is a section on line 9-9 of Fig. 2 and,

Fig. 5 is a side elevation with the casing wall removed. I

Specification of Letters Patent.

Patented llct. 28, 1919.

Serial No. 762,352.

.1, as regards the arrangement of superheaters themselves, a high pressure and an intermediate'pressure superheater are shown on the right-hand side of the boiler and a low pressure superheater only on the lefthand side. The high pressure superheater onsists cf tubes, (5 passing from a header, to a header, f while the intermediate pressure superheater on the same side comprises tubes d passing from a header, to a header, f All the headers as seen 'in Fig. 5 are less in length than the length of the boiler itself, while the headers, e, 7, are in staggered relationship to the headers, c P, so that the header ends may be accessible. On the left-hand side of the boiler, the low pressure superheater is arranged 'comprisin'g tubes, 0Z passing from a header, 6 to a header, f this superheater in accordance with the invention working in conjunction with some only of the water tubes, 0, the remainder being associated with addltional tubes, z. The uptakes are arranged as beferent par, of the installation is as follows:

From the steam drum, a, the steam passes through the pipe, h to the saturated steam header, c of the high pressure superheater, thence through the superheater tubes, (1, to the superheated steam header, and through a pipe 2, to the first stage 2' of the turbine. After expanding in this stage, steam leaves by the pipe. 3, and passes to the saturated steam header, c of the intermeseen that between comparatively wide limits the degree of superheat in any or all of the superheaters may be varied or one or more of them may be cut out entirely if desired.

In some cases either the initial superheater or one or more of the reheaters may be omitted entirely.

It is advisable Whatever the precise arrangement of additional heat absorber adopted that a section of it at least should be disposed in each duct so that the gases arein every case cooled to the greatest possible extent before coming into contact with the dampers, v

Although certain specific examples of the invention have been described in detail by ay of illustration it will be evident that the principle on which it is based can be embodied in a varietyof different structural forms.

Having now I claim as new and desire to ters Patent is 1. The combination with a motor element including a plurality of sections wherein the motive fluid undergoes progressive expansion, of means for super-heating the motive 'Eluid prior to its discharge into each of said sections, said means comprising a boiler element including a steam drum and superheating elements in series with said motor sections, one another and said steam drum, and means for independently control.- ling the supply of heating products to the superheaters.

described my invention What secure by Let- 2. In combination with boiler elements substantially as described, pressure superheat-ing elements in series therewith and with each other and difierentially controlled ducts for the heating products in which ducts the elements are located.

3. In combination, boiler elements, high, interi'nedial'e and low pressure superheater elements in series therewith and with one another for supplying superheated steam at different pressures and temperatures and differentially controlled ducts in which said elements are disposed.

l. In combination. in a boiler, steam and Water drums connected by Water tubes. a grate, a boiler casing and partitions dividing said casing into flue compartments through which the flue gases pass in parallel streams and superheater elements designed to receive steam at different pressures and disposed in certain of said comparti'nents,

said superheater elements being arranged in series with one another.

5. In combination, in a boiler, steam and Water drums connected by Water tubes, a grate, a boiler casing and partitions dividing said casing into flue compartments, superheater elements designed to receive steam at different Working pressures, said superheater elements being disposed in certain of said compartments and being.in series with the Water tubes and with one another and damper means controlling the outlets from said fiue compartments.

6. In combination, in a boiler, steam and Water drums connected by Water tubes, a

grate, a boiler casing and partitions dividing said casing into flue compartments, additional Water tubes in one of said compartments, superheater elements each located in one of the other compartments, said super-. heater elements being adapted to receive steam at different Working pressures, said superheater elements being connected in series With one another and damper means for independently controlling the outlet from the flue compartments.

7. A .Yarrow-type Water-tube boiler in cluding a grate, and a plurality of superheater elements designed to receive steam at different Working pressures, said superheater elements being disposed on the side of the Water tubes of the boiler remote from the grate, and being connected in series.

8. A Yarrow-type Water-tube boiler including a giate, and a plurality of superheater elements designed to receive steam at different Working pressures, said superhcater elements being disposed on the side of the Water tubes of the boiler remote from the grate, and being connected in series, and means for varyingas to each superheater the relative flow of hot gases from the grate to the superheater.

9. In combination, boiler elements, superheater elements in series therewith and with each other and designed to receive steam at difierent Working pressures, a series 0 ducts, one of said ducts containing boiler elements only and the others the superheater elements, the duct containing the boiler elements serving as a by-pass, substantially as described.

In testimony whereof, I aiiiX my signature in presence of tWo Witnesses.

SEBASTIAN ZIANI DE FERRANTI.

Witnesses BASIL Z. on Fnnnan'rr, LUCY UNWIN. 

